68668997 has 2 divisors, whose sum is σ = 68668998. Its totient is φ = 68668996.

The previous prime is 68668949. The next prime is 68669009. The reversal of 68668997 is 79986686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42393121 + 26275876 = 6511^2 + 5126^2 .

It is a cyclic number.

It is not a de Polignac number, because 68668997 - 2⁸ = 68668741 is a prime.

It is a super-2 number, since 2×68668997² = 9430862297972018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68668097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34334498 + 34334499.

It is an arithmetic number, because the mean of its divisors is an integer number (34334499).

Almost surely, 2^68668997 is an apocalyptic number.

It is an amenable number.

68668997 is a deficient number, since it is larger than the sum of its proper divisors (1).

68668997 is an equidigital number, since it uses as much as digits as its factorization.

68668997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7838208, while the sum is 59.

The square root of 68668997 is about 8286.6758715422. The cubic root of 68668997 is about 409.4996812076.

The spelling of 68668997 in words is "sixty-eight million, six hundred sixty-eight thousand, nine hundred ninety-seven".